law enforcement officials are calling it a super tunnel. it is the length of six football fields connecting tijuana and san diego underground. this is serious, folks. our miguel marques has a closer look. >>. >> reporter: this is the door where the agents burst down and the agents entered on the u.s. side in the tunnel. 600 yards or so south of where we are standing in mexico a few feet from the border there is another hole that goes down into the ground and where this tunnel zig zas zags izags its way to t here. law enforcement says the investigation is only beginning and they examine apect and hope arrests. >> i will offer on there to the drug cartels. we are by no means finished here and don't say we didn't warrant you. you go underground, you will be fou found. >> reporter: the fact they found cocaine they believe the cartels are more desperate to get coke and hard drugs in. that said the amount of hard drugs coming into the san diego and southern california region has grown in recent years in cocaine and methamphetamine and heroin goin